READ TIMES FOR BACTERIORHODOPSIN-FILM OPTICAL CACHE MEMORY

Citation
Ch. Wang et al., READ TIMES FOR BACTERIORHODOPSIN-FILM OPTICAL CACHE MEMORY, Journal of the Optical Society of America. B, Optical physics, 14(9), 1997, pp. 2304-2309
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Optics
ISSN journal
0740-3224
Volume
14
Issue
9
Year of publication
1997
Pages
2304 - 2309
Database
ISI
SICI code
0740-3224(1997)14:9<2304:RTFBOC>2.0.ZU;2-X
Abstract
We report measurements of nonlinear-optical responses of bacteriorhodo psin (BR) films of long intermediate-state lifetimes. Nanosecond-durat ion pulses were used as the excite beam and cw monochromatic light was used as the probe beam in excite-probe experiments. The results revea l that, whereas the response time of the BR films is of the order of m illiseconds at the probe wavelength of 633 nm used in earlier experime nts, it is of the order of 100 mu s at probe wavelengths of 600 nm and below. Contrast ratios and insertion losses were also measured at dif ferent probe wavelengths and probe irradiance levels; the maximum cont rast ratio was found to be similar to 3:1. The implications of these r esults for the application of BR films as optical cache memory devices are discussed. (C) 1997 Optical Society of America.